BlockViz: free crypto visualizations + portfolio tools I built. Feedback?

[blockviz]

Hey Bitcointalk members,

I’ve been building a free-to-use crypto analytics site called BlockViz. It started as a "I think there is a gap between simple CMC-sparklines and a pure TradingView Candle Chart", and it’s turned into a small toolbox that I keep adding to.

Link: https://blockviz.xyz

I’m posting here mainly to find out:
- Do these tools look useful to you, or if not, why not?
- What should I build next, and what do you wish existed / consider valuable?

What’s on BlockViz right now (high level)
Price tools
• Technical analysis chart (candles/line, log/linear, indicators like SMA/EMA/BB/RSI/MACD)
• Indexed comparison (normalize two assets to 100 so you can compare performance properly)
• Best/worst days heatmap (see how much returns depend on a handful of days)
• Seasonality heatmap (monthly and quarterly returns across years)

Market cap tools
• Dominance (share of total market, a category, or your own basket)
• Market cap development (absolute vs percent share views)
• Treemap (coins or categories, absolute or change view)

Portfolio tools
• Portfolio tracker (holdings + cost basis, allocation, unrealized PnL)
• Portfolio development (value and allocation over time)
• Portfolio comparison (compare real portfolios and model allocations like 80% BTC 20% ETH, indexed to 100)

Simulators
• Market cap parity (what if X matched Y’s market cap)
• HODL vs DCA
• Coin flip (switch coin A to coin B at start, compare vs holding)
• Sell and buy back (trim, sit in cash, re-enter later)
• Stop loss (fixed and trailing)

There’s more in the menu, but those are the main ones.

What I’d love feedback on
- If you clicked around for a few minutes, what felt immediately useful and what felt pointless?
- Any tools you personally use elsewhere that you wish were done cleaner or faster?

Looking forward:
Right now the tool is free and I’m not trying to sell anything. But paying the price data provider and hosting the database and simulations are already costing me money, so I’m curious:
• If I added a paid tier later, what would actually consider worth paying for? Examples: saved layouts/indicator sets, more portfolios, price/trading signal alerts, CSV exports, more history, ... that kind of thing.
• Or would you rather see donations / ads. I personally hate ads, so I am trying to avoid that route...

If you’ve got strong opinions either way, I’m all ears, looking forward to them  

Thanks for taking a look, and feel free to be blunt. Bugs, feature requests, “this sucks”, all welcome!

[OmegaStarScream]

I'm not really much of a trader, so I cannot comment on everything, but the porfolio tracker is something that needs more work. Right now, this doesn't look any different from CMC for example. What you want, is proper tracking like Delta app for example.
You want to give the user the ability to import addresses, master public keys (to watch all of the wallet), API keys from exchanges (read-only keys otherwise no one would trust your site), etc. Basically all the needed things to help the user have his portfolio in one page without having to write the numbers himself. Everything should be pulled automatically.

[blockviz]

porfolio tracker is something that needs more work

Thanks for the quick reply. I would say regarding Portfolio Tracker, yes, CMC offers something similar, but a bit less interactive (e.g. no cross filtering), also no bar charts for quick visual performance cues across multiple timeframes at one glance.
What visualization would you like to have added for the Portfolio Tracker?

Differentiation for Portfolio is definitely the Comparison feature. This CMC does not have (and as far as I found also nobody else...).
i.e. you can compare your portfolios among each other but also against standard Model Portfolios. i.e. Benchmark it. Is your custom effort even working...

Regarding data import: yes, this is something I have already thought about, but would definitely be a bigger effort as it is so heterogenous (different Block Explorers so many different exchanges with different CSV export formats...) But I agree, it would be super nice.
Maybe the industry could agree on a standard format... that would be helpful

[BattleDog]

I agree with the direction here... the "comparison / benchmark" angle is the part that can actually make this feel like more than another CMC skin. But the portfolio tracker itself has to become mostly zero-effort or people will bounce. Watch-only by default (addresses/xpubs), and if you add exchange support keep it read-only and make the UX scream "never paste private keys here" like it's a fire alarm.

On the messy CSV/explorer jungle: don't try to support everything on day one. Pick a couple of common sources, publish a dead-simple canonical CSV template, and let users map columns on import. If you nail a clean "bring your own data" pipeline and keep the charts fast, the rest can grow organically without you drowning in edge cases.

[blockviz]

the "comparison / benchmark" angle is the part that can actually make this feel like more than another CMC skin. [...]  publish a dead-simple canonical CSV template, and let users map columns on import.

Hey, and thanks for the great feedback!
(1) I find it interesting that both of you just reference the Portfolio part. So you you find the price, market cap and simulation tools not valuable or do they already exist somewhere?
(2) With "Comparison / Benchmark" did you mean just the portfolio comparison aspect, or also the "Indexed Comparison" where you can super quickly any two coin's relative price performance on an indexed basis?
(3) And excellent idea with the canonical CSV template. After all, it is still easier for a user to do some VLOOKUP in an Excel to get it into a specific column order than offering a gazillion "standardized" imports that break once the exchange changes the export template. I will add this to the dev queue for sure.

[OmegaStarScream]

(1) I find it interesting that both of you just reference the Portfolio part. So you you find the price, market cap and simulation tools not valuable or do they already exist somewhere?

It's not about them being somewhere else. I believe it's best to focus on thing and give a very solid product, then jump to the next thing, as opposed to provide multiple things all together. And the  reason why I think the portfolio tracker is what you should start with is because of the demand. Everyone wants to keep track of their assets across multiple platforms, while the price tools, and the other things are not something ALL people are interested in.

For the simulators, I think the Market cap parity is a nice one and would definitely make people comeback to the site once it kicks off, especially on CT (crypto twitter) and Reddit. The sharing feature is also great (snapshot, PNG download and link). Although, I do think the whole page need to be redesigned. You could easily improve the UX.

[blockviz]

For the simulators, I think the Market cap parity is a nice one once it kicks off, especially on CT (crypto twitter) and Reddit. The sharing feature is also great (snapshot, PNG download and link).
Although, I do think the whole page need to be redesigned. You could easily improve the UX.

(1) CT and social media is the biggest pain to be honest. No reach at all. Difficult to get of zero. Even when putting in effort, like 10 people see the post. I guess I need to pay influencers to use and showcase the tools...
(2) Portfolio: yes, I will work on that next. I agree with your points. Although I do hope the other tools are not coming across as just "thrown out there", I put a lot of effort into making them simple yet meaningful.
(3) UX: I consider myself somewhat of a UX-"nerd", since I get annoyed by bad UI, unnecessary clicks, not thought through design. So that one is a bit surprising. I use the page every day creating content for social media, and I do feel like it is good UX, but maybe I just got used to it?
So I would be very much interested in what you mean with "easily improve UX" or "Need to redesign" the whole page.
If you find the time, please share more! Thanks.

[yhiaali3]

Looking forward:
Right now the tool is free and I’m not trying to sell anything. But paying the price data provider and hosting the database and simulations are already costing me money, so I’m curious:
• If I added a paid tier later, what would actually consider worth paying for? Examples: saved layouts/indicator sets, more portfolios, price/trading signal alerts, CSV exports, more history, ... that kind of thing.
• Or would you rather see donations / ads. I personally hate ads, so I am trying to avoid that route...

I'd like to thank you for your work. I actually liked the site, although it needs some development, but overall it's good.
Regarding your question, I would suggest the Freemium + Paid Pro Tier model
which is ad-free with an optional donation option and some paid features.

What should remain free so the user doesn't feel like you're "locking up" the essentials:
Basic fees , Simple comparisons ,Treemap ,Dominance
Simple simulators ,Single wallet ,Basic daily/weekly data

Paid: These services can be further expanded with a monthly or annual paid plan.
Workspaces , Alerts ,Extensive Historical Data ,Export
Unlimited Wallets ,Advanced Emulators ,API Sync

[blockviz]

I'd like to thank you for your work. I actually liked the site, although it needs some development, but overall it's good.

Hi and thanks for the feedback. You are welcome, and glad you like it.
Can you share where you think the page needs more development? UI? Features? Bugs?

And regarding Paid tiers, yes, the more I read about founders pages and solo-devs, everybody says to add the paid tier as early as possible to get feedback from the people actually paying for it.
So I am working on Stripe and subscription integration right now.
I am thinking of keeping every tool available for the free users, but with limited time back (i.e. not all history) and only 1 watchlist/portfolio. Then they can literally check the whole tool, see if they like it and if worth to them, upgrade.

[r_victory]

I liked the simulators and the choice of Coingecko as a price tracking tool; I use it even more than CoinMarketCap, which is also a great tool. It seems you have a lot of work ahead of you. Even though there are gaps, as you mentioned, these sites are extremely useful and, in a way, "innovative" with many great features. Keep developing and evolving; I believe you will earn your place.

[yhiaali3]

I'd like to thank you for your work. I actually liked the site, although it needs some development, but overall it's good.

Hi and thanks for the feedback. You are welcome, and glad you like it.
Can you share where you think the page needs more development? UI? Features? Bugs?

For example, the site is rich in tools, but lacks a clear help center. You assume users already know everything about indicators, DCA, parity, etc., but many new users would like to learn more about these tools, so adding short tutorials or explanatory videos with practical examples might be helpful.

Adding FAQs would also make the site much easier for new users. An interactive tour would also be very useful.

For the Portfolio Tracker, some improvements could be made, such as optimizing data display on smaller screens and adding simple alerts or notifications, and the ability to import data from CSV or API.

[blockviz]

the site is rich in tools, but lacks a clear help center. You assume users already know everything about indicators, DCA, parity, etc., but many new users would like to learn more about these tools, so adding short tutorials or explanatory videos with practical examples might be helpful.

Thanks for the feedback.
I think some of what you are looking for already exists.
e.g. Explanations of every tool are available in the Guides section https://blockviz.xyz/guides. They are prominently in the Main Nav bar AND I also put a help icon behind each tools Title on the respective tool page (e.g. https://blockviz.xyz/market-cap/dominance), that also links to the guide. Not sure how to make it more clear, without being overly intrusive for the people that already know how to use it.
And for the terms and concepts I also have a dedicated Wiki: https://blockviz.xyz/wiki which is also in the Nav bar, but I also linked the relevant terms from the guide pages.

Preparing walkthrough-videos and publishing them on YouTube is already on my to-do list. That makes sense!

Mobile improvements are tricky tradeoffs. Do you hide the Y axis to have more space for the chart but lose context? On desktop you can easily hover and use tooltips for context, while the touch-interface on mobile can be clumsy for interacting with charts. I guess some visualizations are just not meant for mobile, but I will take another look at how to improve the mobile experience. Thanks.

[tikoniko]

First of all, great work. It’s clear you put a lot of effort into building this project, and I respect that.
That said, I’m being honest here: right now I don’t see enough features that really differentiate it from existing platforms. Most users already use tools like CMC, TradingView, or portfolio apps and they’re comfortable with them. Because of that, I think it will be very hard to attract users away from platforms they already trust and use daily.
From a monetization point of view, I also struggle to see how this becomes profitable. If it turns into a paid service without offering something truly unique, you might lose users instead of gaining them.

My personal advice would be to focus on something new that other platforms don’t offer. For example, deeper integration with trading, or a unique investment concept like crypto indices (one trade that gives exposure to multiple coins), or any feature that clearly answers: “Why should I use this instead of what I already use?”
Finding a clear niche and building strongly around it could make the difference.

I wish you the best of luck with the project.

[blockviz]

My personal advice would be to focus on something new that other platforms don’t offer.

Thanks for the candid feedback. I am using CMC and TradingView too.
As far as I have found you cannot easily compare one or multiple coins on an indexed basis or do the kind of simulations (which represent common questions I - and hopefully others - have).
So, sure, if someone is happy to just glance at a few sparklines on CMC and that is enough for his purpose, it is clearly not a person willing to pay.
But if you are diving deeper and care about relative performance, as well as the visualization and simulation aspect, I hope the value prop is clearer.

But I guess, I need to first offer the paid subscriptions and figure out what people REALLY care about and would be willing to pay for.
I think the portfolio aspects already discussed above are the right next thing.
By the way, they also cover what you are looking for. You can easily duplicate a model portfolio from a pre-configured template that covers the Top10 or Top20 coins as a kind of "Index" to follow.
I just need to find a way to make the features even clearer.

[Pmalek]

I am a bit confused with your price tracker. Why does it show that bitcoin is worth $88k, ether $2,9k, etc.? I almost thought something significant had happened today and the market bounced upwards as a result of it. Turns out, it's just wrong and bitcoin is going below $81k as I am writing this. Is the price tracker not updating in real-time?

[blockviz]

I am a bit confused with your price tracker. Why does it show that bitcoin is worth $88k, ether $2,9k, etc.? I almost thought something significant had happened today and the market bounced upwards as a result of it. Turns out, it's just wrong and bitcoin is going below $81k as I am writing this. Is the price tracker not updating in real-time?

Hi and thanks for the message. I had a look and I think you are right, there seems to be a caching issue. The prices are updating every ~7 mins currently. But indeed in the tracker they were outdated. When I hard-refreshed (ctrl + R) it pulled the proper prices. On the CoinDetail pages (e.g. https://blockviz.xyz/coin/bitcoin the prices WERE the most recent ones though.
So the caching duration should be max 7 mins from the server side, but clearly something is not working. I will investigate and fix this over the next 2 days.
Will let you know! Cheers.

[blockviz]

Is the price tracker not updating in real-time?

Alright, so I investigated the issue and you were indeed served a stale cache. The time-out I had only served the freshly fetched data to the next user...
I lowered the server caching time even more, AND introduced an additional safe-guard on client side, so when you load the page it will check the time stamp and if it is older than 5 minutes (e.g. because for whatever reason you got served a stale cache) it will trigger a refetch. So you might notice the lines/prices wiggle as they reload.
But now it should be always the latest price. But I will keep an eye on it.

https://www.talkimg.com/images/2026/02/01/UEEut9.png

Regarding your other question:
I think the 7 min delay is pretty much "live" enough for 99% of the cases, but yes technically I can also fetch every 30 seconds.
Currently since I pay API, hosting, DB costs all by myself, I didn't do so yet (to save API credits).
Once I have paying subscribers and they wish to have real live-live data, I could add it. No issue.