
Fixer.io
ExchangeRate-API
Currencyapi.com
Currencylayer
Open Exchange Rates
BestExchangeRates
Freecurrencyapi.com
Simple API for Global Currency Exchange Rates

The modern platform for creating, sharing, and collaborating on AI prompts. Advanced version control and real-time testing.

Which is more popular?
Based on our record, Exchangeratesapi.io seems to be more popular. It has been mentioned 19 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | exchangeratesapi.io | diffyn.com |
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| Company | 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


ExchangeRatesAPI.io provides reliable exchange rate and currency conversion data through an easy-to-integrate API for websites, applications, and businesses.
No description of Diffyn yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of Exchangeratesapi.io yet.
Overall verdict
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The Ultimate Prompt Tool for Creators – Visualize & Organize with Diffyn
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Exchangeratesapi.io and Diffyn.
Diffyn's answer:
Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.
Diffyn's answer:
Diffyn is the platform that specializes on both change management and multi-model analysis.
Diffyn's answer:
React, Next.js, POSTGRESQL
Diffyn's answer:
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
Diffyn's answer:
I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.
Share your experience with using Exchangeratesapi.io and Diffyn. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Exchange Rate: Their REST API interface delivers currency exchange rate data for hundreds of currencies, allowing up to 1,000 monthly requests for free. - Source: dev.to / over 2 years ago
- Currency: I use a free tier to hourly 'cache' on the repo, latest rates based on https://exchangeratesapi.io [2] (for basic traveler's currency I find this a reasonable balance) - The landing page website [3] is made with SvelteKit,... - Source: Hacker News / over 2 years ago
Here's an API built on top of this data that allows for more fine tuned queries. https://exchangeratesapi.io/ https://github.com/exchangeratesapi/exchangeratesapi. - Source: Hacker News / about 3 years ago
Tracking Diffyn since Jun 2025.
When comparing Exchangeratesapi.io and Diffyn, you can also consider the following products.

Fixer provides a free, simple, and lightweight API for current and historical foreign exchange rates and currency conversion. The API tracks rates published daily by the European Central Bank.
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An easy to use, free & reliable Exchange Rate API trusted by tens of thousands of developers since 2010!
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Currencyapi.com is a free, reliable & feature complete currency exchange rates API. 170+ world currencies & 60 second update rate.
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Free and startup-friendly currency converter JSON API for real-time and historical exchange rates - reliable and accurate, supporting 168 world currencies.
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Free, hourly-updated exchange rates - a simple, accurate, open-source JSON API. Free for personal use, a bargain for everybody else.
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Compare FX and save when you send or spend abroad
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