Shortlist by what you need
Start here if you know why you are leaving GPT Calculator.
Want the closest match?
reAPIMost similar to GPT Calculator in what it does, its category and its price.
Visit (opens reAPI in a new tab)Need a free plan?
RequestyHas a free plan, rated 3.9 out of 5.
Visit (opens Requesty in a new tab)Want the lowest price?
SeedRouterFrom $20/mo, the lowest starting price here.
Visit (opens SeedRouter in a new tab)Want the best rated?
AI/ML APIRated 4.1 out of 5 in our review, against 2.8 for GPT Calculator.
Visit (opens AI/ML API in a new tab)
At a glance
Green means better than GPT Calculator, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 GPT CalculatorBaseline | 2.8 | Free | Yes | Free, one-developer tool that counts tokens and estimates the cost of a GPT prompt, now labelled an archived, client-side tool. | |
| reAPI | 3.9+1.1 | Not listed | No | Shows the exact per-model rate - Seedance 2.5 at $0.071/second - instead of a flat markup. | vs GPT Calculator |
 AnyAPI | 2.9+0.1 | Free | Yes | Craft the perfect GPT-3 prompt with A/B testing, then get a live API endpoint ready to power your next AI feature - free during beta. | vs GPT Calculator |
| Requesty | 3.9+1.1 | Free | Yes | One API for 600-plus models, marked up 5%, with the markup stated on the page. | vs GPT Calculator |
| SeedRouter | 3.8+1.0 | $20/mo | No | One API key for image, video, language and audio models with pay-per-request billing from a prepaid balance, and no charge for failed requests. | vs GPT Calculator |
 Promptmetheus | 3.4+0.6 | Free | Yes | A prompt engineering IDE with access to 150+ LLMs across 15+ providers - build, test, and evaluate prompts systematically instead of trial-and-error in a chat window. | vs GPT Calculator |
 CometAPI | 3.8+1.0 | Not listed | No | CometAPI routes requests to 500+ AI models from OpenAI, Anthropic, Google, and other providers through a single API key priced below list rate. | vs GPT Calculator |
| AI/ML API | 4.1+1.3 | $20/mo | No | Single OpenAI-compatible endpoint for calling GPT, Claude, Gemini, and 400-plus other AI models. | vs GPT Calculator |
 Dreamspace | 3.2+0.4 | Not listed | No | Node-based infinite canvas for running, comparing and chaining prompts across OpenAI, Anthropic and Replicate models, with a live demo and a paid Pro tier. | vs GPT Calculator |
The alternatives in detail
In order of how closely each one matches GPT Calculator.
reAPI
3.9Not listed
vs GPT Calculator+1.1
Shows the exact per-model rate - Seedance 2.5 at $0.071/second - instead of a flat markup.
- Unified API for image, video, chat, music and code models
- Transparent per-model pricing shown directly on the site
- Automatic failover with 99.96% uptime
Publishes real per-model rates instead of an opaque flat markup
Beta status on infrastructure other products would depend on
AnyAPI
2.9Free
vs GPT Calculator+0.1
Craft the perfect GPT-3 prompt with A/B testing, then get a live API endpoint ready to power your next AI feature - free during beta.
- Craft and A/B test GPT-3 prompts before deploying
- Generates a live, callable API endpoint from a finished prompt
- Structured JSON output formatting for easy programmatic use
Free during beta with no cost currently disclosed
No premium or post-beta pricing disclosed
Requesty
3.9Free
vs GPT Calculator+1.1
One API for 600-plus models, marked up 5%, with the markup stated on the page.
- Routes across 30+ providers and 600+ models
- Automatic failover, load balancing and cost/latency-based routing
- Prompt caching claimed to cut token costs up to 90%
States its 5% markup plainly rather than burying it in a rate card
A single routing layer between your app and every model is a new dependency
SeedRouter
3.8$20/mo
vs GPT Calculator+1.0
One API key for image, video, language and audio models with pay-per-request billing from a prepaid balance, and no charge for failed requests.
- Single API key across image, video, language and audio models
- OpenAI and Anthropic SDK compatibility for language models
- Prepaid USD balance with per-request billing
No monthly minimum or subscription
Prepaid balance model needs a top-up before any call
Promptmetheus
3.4Free
vs GPT Calculator+0.6
A prompt engineering IDE with access to 150+ LLMs across 15+ providers - build, test, and evaluate prompts systematically instead of trial-and-error in a chat window.
- Access to 150+ LLMs across 15+ providers in one workspace
- Automatic Evaluators score outputs against defined criteria
- Built-in cost calculation across models and providers
Genuinely broad model access (150+) rather than 2-3 providers
Free Playground tier is limited to OpenAI models only
CometAPI
3.8Not listed
vs GPT Calculator+1.0
CometAPI routes requests to 500+ AI models from OpenAI, Anthropic, Google, and other providers through a single API key priced below list rate.
- Single API key for 500+ models across major AI providers
- Pay-as-you-go pricing around 20% below providers' list rates
- One-line model switching without re-authentication
Cuts the integration work of managing multiple provider SDKs and keys
Founded in January 2025, with a limited track record so far
AI/ML API
4.1$20/mo
vs GPT Calculator+1.3
Single OpenAI-compatible endpoint for calling GPT, Claude, Gemini, and 400-plus other AI models.
- Single endpoint for 400-plus AI models
- OpenAI SDK-compatible, no code rewrite needed to switch models
- Unified credit-based billing across all providers
One integration covers hundreds of models instead of numerous separate SDKs
No permanent free tier once starter tokens are used
Dreamspace
3.2Not listed
vs GPT Calculator+0.4
Node-based infinite canvas for running, comparing and chaining prompts across OpenAI, Anthropic and Replicate models, with a live demo and a paid Pro tier.
- Infinite canvas for running, comparing and chaining LLM prompts
- Bring-your-own-key connections to OpenAI, Replicate and Anthropic
- Visual chains and forks between prompts, chat threads and outputs
Visualises prompt chains and forks rather than a single flat chat log
No price is published anywhere on the site
FAQ
Questions people ask
Is GPT Calculator free?
GPT Calculator has a free plan.
What is the best free alternative to GPT Calculator?
Requesty is the highest-rated alternative here with a free plan (3.9 out of 5). Other free options: Promptmetheus, AnyAPI.
What is the cheapest alternative to GPT Calculator?
Among paid plans, SeedRouter has the lowest starting price (from $20/mo). If you need it free, start with Requesty.
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.