Pricing & plans
Diglot has a plan for every kind of writer — from a casual learner polishing emails to a graduate student finishing a thesis. You start free, and you can upgrade, downgrade, or cancel any time. This page explains what each plan costs, what’s included, and how the limits work.
Plans at a glance
Section titled “Plans at a glance”| Plan | Price | Best for |
|---|---|---|
| Free | $0 | Trying Diglot and everyday light writing |
| Spark | $19/mo, or $190/yr (about $15.83/mo) | Regular writers who want more room and better AI |
| Pro | $29/mo, or $290/yr (about $24/mo) | Students and professionals doing serious, high-stakes writing |
| Max | $200/mo | Power users and researchers who need the most capacity |
| Universities (B2B) | $5–10 per student/year | Schools that want a campus-wide rollout |
Every paid plan comes with higher AI writing quality and larger monthly limits. See AI quality tiers for what “better AI” means in practice.
What each plan includes
Section titled “What each plan includes”Free — A real, permanently free plan (no “free for X days” trick). You get basic writing assistance, limited monthly usage, one paraphrase suggestion per request, 3 plagiarism previews per month, and 5 AI-detection scans per month. You can see a preview of the Authorship Certificate.
Spark ($19/mo) — Larger monthly limits, two paraphrase suggestions per request, nine paraphrase modes, full plagiarism scanning, higher-quality AI, the Co-writer in Ask and Edit modes, and document export to Word, PDF, and Markdown.
Pro ($29/mo) — Our largest standard limits, three paraphrase suggestions per request, all ten paraphrase modes, our highest-quality AI, the full Authorship Certificate, the Co-writer’s Plan mode, and unlimited document exports in every format.
Max ($200/mo) — Everything in Pro, with 20× the monthly limits, the deepest assistant memory and cross-session recall, and maximum reasoning effort. Built for heavy daily use and research workflows. Max is billed monthly.
Universities ($5–10 per student/year) — A campus-wide install with a Certificate verification tool, an admin console, and per-institution branding. Contact us to set this up.
Monthly limits by plan
Section titled “Monthly limits by plan”Each tool has its own monthly allowance. Everything below resets on the 1st of each calendar month (UTC) — it’s not tied to your billing date. “Unlimited” means there’s no monthly cap on that tool.
| Tool | Counted in | Free | Spark | Pro | Max |
|---|---|---|---|---|---|
| Translate | words/mo | 5,000 | 50,000 | 100,000 | 2,000,000 |
| Paraphrase | words/mo | 3,000 | 25,000 | 50,000 | 1,000,000 |
| Grammar | words/mo | 20,000 | 100,000 | 200,000 | 4,000,000 |
| Co-writer | messages/mo | 50 | 200 | 500 | 10,000 |
| Plagiarism preview | scans/mo | 3 | 50 | Unlimited | Unlimited |
| Plagiarism full scan | scans/mo | 0 | 3 | 5 | 100 |
| AI detection | scans/mo | 5 | 30 | Unlimited | Unlimited |
| Citations | lookups/mo | 10 | 100 | Unlimited | Unlimited |
| Synonyms | lookups/mo | 20 | 300 | Unlimited | Unlimited |
| Research — add pages | pages/mo | 0 | 100 | 1,000 | 20,000 |
| Research — ask your library | queries/mo | 5 | 100 | Unlimited | Unlimited |
| Research — web search | queries/mo | 0 | 100 | Unlimited | Unlimited |
| Research — deep research | jobs/mo | 0 | 0 | 30 | 600 |
| Saved research sources | total saved | 3 | 50 | 500 | 10,000 |
| Documents | total saved | 25 | Unlimited | Unlimited | Unlimited |
| Export | jobs/mo | 10 | 50 | Unlimited | Unlimited |
| Certificates | per/mo | 1 | 5 | Unlimited | Unlimited |
A few things worth knowing:
- The Humanize feature shares your Paraphrase word allowance — it doesn’t have a separate limit.
- Documents and saved research sources are total caps, not monthly meters. They don’t reset; you free up room by deleting items.
For a deeper look at what you’ll see as you get close to a limit, see Quotas & limits.
Plan features
Section titled “Plan features”Some things are simply on or off depending on your plan:
| Feature | Free | Spark | Pro | Max |
|---|---|---|---|---|
| Co-writer | Ask only | Ask + Edit | Ask + Edit + Plan | Ask + Edit + Plan |
| Full plagiarism scan | No | Yes | Yes | Yes |
| Export formats | Plain text | + Word, PDF, Markdown | All formats | All formats |
| Custom templates | No | No | Yes | Yes |
| Template Gallery | No | No | Yes | Yes |
| Plagiarism-safe paraphrase mode | No | No | Yes | Yes |
| Full assistant memory + cross-session recall | No | No | No | Yes |
How billing works
Section titled “How billing works”You’re on the Free plan by default after signing up — no payment details needed. To move to a paid plan, head to billing (the upgrade button in the sidebar, or any upgrade prompt in the app).
- Upgrading takes effect right away. Your new plan and larger limits unlock as soon as the payment goes through.
- Switching monthly ↔ annual is easy and pro-rated. Annual saves roughly 16–17% (Spark: $190/yr instead of $228, saving $38; Pro: $290/yr instead of $348, saving $58).
- Downgrading or canceling keeps your paid features until the end of the period you’ve already paid for. After that, you drop to the new plan’s limits.
- Your work is always safe. Downgrading or canceling never deletes anything — your documents, glossary, history, and settings stay exactly as they are.
- Refunds — we offer a 30-day money-back guarantee. Just contact support.
Checkout happens on a secure, hosted payment page, so Diglot never sees your card details. For the full walkthrough of upgrading, the billing portal, and payment issues, see Billing & payments.
Free trial
Section titled “Free trial”New accounts get a 7-day trial automatically — no credit card required. When it ends, you simply move to the Free plan, and all of your documents, glossary, and settings are kept. You can upgrade at any time. We’ll email you reminders along the way (on days 1, 3, 5, 7, and at expiry).
Earn more through referrals
Section titled “Earn more through referrals”Free and Spark users can unlock higher AI quality for a while by inviting friends:
- 3 friends join → Smart AI for 14 days
- 10 friends join → Native AI for 30 days
- 25 friends join → Native AI for 90 days, plus 50,000 bonus words
These boosts raise your AI quality, but they don’t change your monthly limits — a Free user with a boost still has Free-level allowances, just with better AI. See Referral program for the full details.
Common questions
Section titled “Common questions”Is the Free plan really free forever? Yes. There’s no hidden countdown — Free is a real, permanent plan with limited but genuine functionality.
Can I switch between monthly and annual? Yes, any time. The change is pro-rated, and annual saves about 16–17%.
Why are there different tiers? Different writers have different stakes. A grad student finishing a thesis benefits most from Pro’s top-quality AI; a casual learner writing emails is well served by Spark; and anyone can start free. The plan name reflects the writing quality you get, not just the price.
Does the Authorship Certificate work on Free? Free users can see a preview of what the Certificate would contain. Generating, downloading, and sharing a full Certificate is a Pro feature.
How much can I do on the Free plan? See the limits table above. The key Free numbers: 5,000 translate words, 3,000 paraphrase words, 20,000 grammar words, 50 Co-writer messages, 3 plagiarism previews, and 5 AI-detection scans per month, plus up to 25 saved documents.
Can I save my best AI quota for important work? Yes. On Pro, you can switch to a lighter AI quality for simple tasks (like a quick grammar check) and reserve your top-quality AI for high-stakes writing. See AI quality tiers.
Is there a team plan? Not yet for self-serve. For multi-seat or campus rollouts, reach out about our university plan.
Was this article helpful?
Thanks for the feedback! 🎉
Sorry this didn't help — contact support and our team will sort it out.