Quartzite
Verified Oct 15, 2026 ActiveOne markdown chat interface for multiple AI models, with prompt templates and cost previews, billed via your own API keys.
Listed on EffectHub ·
Pricing
- Pricing model
- Paid
- Paid options from
- $3.99/mo
- Billing
- Monthly
One plan, the Early Supporter tier, billed monthly at $3.99 (discounted from $7.99) with a lifetime price lock, all features, an optional onboarding call and Discord access; payments go through Lemon Squeezy. Model usage is billed separately by each provider against your own API keys.
Use tool ↗About Quartzite
Quartzite is a chat client that sits in front of several AI models at once, adding a Markdown prompt editor with saved drafts, version history for comparing prompt iterations and model settings, a template library, variables with CSV import for bulk runs, a prompt optimiser and a cost preview that estimates tokens and spend before a request runs. Instead of charging for model usage it charges a flat subscription for the interface and you bring your own API keys, stored encrypted, so each provider bills you directly. Listed models include Claude Opus 4.5, Gemini 3, GPT-5.1, o3, DeepSeek, Perplexity, Llama 3 and Mistral, plus anything reachable through OpenRouter. It is built by CMD Shift Studio for developers, researchers and other frequent AI users. The only plan is an Early Supporter tier at $3.99 a month, down from $7.99, with a lifetime price lock.
- Platforms
- Web
- API
- Not confirmed
- Last verified
- Oct 15, 2026
Verified sources
- Home page pricing block: Early Supporter Plan $3.99/month, discounted from $7.99, billed monthly with a lifetime price guarantee; usage paid to providers via your own API keys (15 October 2026)quartzite.ai ↗
- Home page: Markdown prompt editor, version history, cost preview, template library, prompt optimiser, variables with CSV import, data export; models listed include Opus 4.5, Gemini 3, GPT-5.1, o3, DeepSeek, Perplexity, Llama 3, Mistral and OpenRouter; footer © 2026 CMD Shift Studio (15 October 2026)quartzite.ai ↗
Is Quartzite legit?
We don’t label tools safe or unsafe. Below are the records we checked ourselves, each with the date we read it.
- Domain registered
- Nov 24, 2023 (2 years ago)Registry record (RDAP), registrar NameCheap, Inc., looked up Sep 17, 2026
- TLS certificate
- Issued by Let's Encrypt, valid until Nov 16, 2026Seen in our own connection to the site on Oct 15, 2026
- Last checked
- Oct 15, 2026The site answered
- Operated by
- CMD Shift StudioOur research, card verified Oct 15, 2026
Pros & cons of Quartzite
Quartzite is a bring-your-own-API-key chat client: you pay a small flat fee for the interface and prompt-management features, then pay each model provider separately for actual usage. That keeps the subscription cheap, but your total cost depends on API pricing you have to track yourself outside the app.
Pros
- combines a markdown prompt editor, version history, and reusable templates in one interface
- shows a cost preview before you send a request
- supports multiple current models including recent releases
- flat interface subscription is separate from and cheaper than a typical single-model subscription
Cons
- you must supply and manage your own API keys for every model provider
- actual usage costs are variable and billed outside Quartzite, so total spend isn't fixed
Best for
- developers who already hold API keys for multiple model providers
- researchers who want prompt version history and reusable templates
- anyone comparing models side by side without juggling separate subscriptions
Not for
- people who don't want to manage their own API keys and billing
- casual users who'd rather have model costs bundled into one flat price
Watch out: The $3.99 Early Supporter price is explicitly framed as a limited, discounted tier — confirm the standing price before assuming it stays that low.
Alternatives to Quartzite
Quartzite head-to-head
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