UnitConversionBot
A no-frills unit converter — type something like "100 ft to m" and get an instant answer covering length, area, volume, weight, temperature, energy and speed. Free and open source.
Key features
- Converts length, area, volume, weight, temperature, energy and speed
- Plain-English syntax like "100 ft to m", no menus to click through
- /convert command works the same way inside group chats
- Open-source code you can read on GitHub
UnitConversionBot
UnitConversionBot skips menus entirely. You type a value and a unit pair in plain text — "10 km to miles", "100 ft to m" — and it replies with the converted number. In group chats the same request goes through the /convert command, so it does not clutter the conversation for people who are not using it.
Behind the scenes it covers the practical categories most people actually need: length, area, volume, weight, temperature, energy and speed. The project is open source and hosted on GitHub under its author's "maltsev" account, running on AWS Lambda — you can read the exact conversion logic yourself rather than trusting a black box. As a secondary feature it can also convert currency, though that is not its main job and shouldn't be the reason you install it.
What it does not have is any kind of onboarding flow, inline mode, or Russian-language interface text. It is a small, single-purpose tool built by one developer, so treat it as a fast pocket converter rather than a polished product — there is no visible support channel if something stops working, and updates depend entirely on that one maintainer's spare time.
How to start
- Open @UnitConversionBot in Telegram
- Type a conversion like "10 km to miles"
- Read the instant reply
- In a group, prefix the same request with /convert
Commands
/convertConvert units inside a group chat, for example /convert 1 km2 to m2Pricing and limits
Free
Pros / Cons
- Free, open source and ad-free
- Understands natural conversion phrases instead of a rigid syntax
- Covers eight practical categories, more than most simple rivals
- No inline mode — you have to open the chat with the bot itself
- No Russian-language interface text
- Small single-developer project with no visible support channel
Score breakdown
| Criterion | Weight | Points | |
|---|---|---|---|
| Functionality | 25 | 8 / 10 | |
| Reliability & speed | 15 | 6 / 10 | |
| Popularity & trust | 15 | 4 / 10 | |
| Price & free tier | 10 | 9 / 10 | |
| Usability | 10 | 7 / 10 | |
| Safety & privacy | 10 | 8 / 10 | |
| Freshness | 5 | 5 / 10 | |
| Localization | 5 | 6 / 10 | |
| No intrusive ads | 5 | 9 / 10 | |
| Score | 100 | 69.0 |
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Does it work if I write to it in Russian?
The interface text is English only, but the query itself is just a value and unit names, so it works the same regardless of the chat's language.
Can it also convert currency?
Yes, as a secondary feature alongside its main measurement-unit conversions.
Technical details
- Inline mode
- Mini App
- Works in groups
- Works in channels
- Accepts voice
- Accepts files
- Requires phone number
- Requires registration
- Shows ads
- Works in Russia without VPN
Reviews
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