Proofsource vs Writesonic GEO
Every Proofsource row on this page is what you get today, and a free trial lets you check each one. For Writesonic GEO's plans and prices, its own site is the source.
Writesonic GEO's own site is the source for its plans.
We describe a competitor only from facts read on its own pages, so for what Writesonic GEO does and what it costs, its site is the current answer.
Every number on this page is measured by Proofsource, and you can check all of it with a free trial.
9 rows, and we only filled in the ones we can be held to.
The Proofsource column is what you get today. The Writesonic GEO column gets a specific only once we have verified it from Writesonic GEO's own pages.
| Question | Proofsource | Writesonic GEO |
|---|---|---|
| Price to start | Free trial; then from $9 a month (5 questions on ChatGPT, weekly) | Check their site[3] |
| Free trial | 200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, no sales call | Check their site[3] |
| Questions tracked | 25 buyer questions in the trial; paid plans pick their questions per brand, each priced per engine. Questions above 50 per brand are 20% off. | Check their site[3] |
| Engines covered | ChatGPT, Perplexity, Claude and Google AI Overviews on the trial; paid plans pick from those 4, each priced per question, and Google AI Mode, Gemini, Microsoft Copilot, Grok, DeepSeek and Meta AI are enabled on a call | Check their site[3] |
| Re-read cadence | Daily or weekly, chosen per plan; answer sets move 9-27% day over day in our sampling, so daily catches the most; the trial runs 2 scans a day apart[2] | Check their site[3] |
| How you buy | Self-serve: the trial gives answers the day you sign up, and checkout takes up to 1000 brands; above that, or for Managed where our team does the work, book a demo | Check their site[3] |
| Statistical confidence | 95% Wilson interval on every percentage; alerts wait until a change clears it[1] | Check their site[3] |
| Root cause and fix | Each gap names the pages the engines cited instead, with a draft fix held for your approval | Check their site[3] |
| Getting your data out | Full history as CSV or JSON, any date range; a REST API with API keys; switched on per customer, our team delivers it into Looker Studio or your BI tool | Check their site[3] |
Every “Check their site” in that column is a cell we could have guessed at and didn't.
Where Proofsource shines: 4 things it is built to do.
Each one is a mechanism, so you get what runs, how often, and what would catch us out if it weren't true.
The free trial is the real report.
The free trial asks 25 buyer questions on ChatGPT, Perplexity, Claude and Google AI Overviews, 2 scans a day apart, and hands back what a subscriber reads: which questions name you on which engine, who is named instead, and the pages each engine cited. No card, no call. One per company domain.
Every number arrives with the interval it was measured at.
Ask an engine the same question twice and you can get two answers, so one read is a draw, not a fact. We publish a 95% Wilson interval on every percentage and hold alerts until a change clears it. A tool that treats a single run as a finding will sell you progress on a day you did nothing.[1]
Four engines from the free trial, 4 on the price card.
ChatGPT, Perplexity, Claude and Google AI Overviews run side by side from the free trial upward, each priced per question on paid plans; Google AI Mode, Gemini, Microsoft Copilot, Grok, DeepSeek and Meta AI are enabled on a call. The questions are re-asked on their own on the cadence you pick: daily or weekly. The full history leaves as CSV or JSON over any date range, or through the REST API, so the record is yours.
Each gap names the page that beat you, then drafts the answer.
A gap carries the sources the engines cited instead of you. Then a draft built on what those pages have and yours does not, held for a human to approve, because nothing should publish itself in your name.
Three good questions to ask any tool in this category.
Try the questions on us first.
Ask what it does when tomorrow's answer is different.
Answer sets move 9-27% day over day in our own sampling. Perplexity moved most at 27%, Claude least at 9%. Read the engines once and what you have is a document: accurate the morning it was written, out of date by the time you present it.[2]
Ask it to name the pages the model is quoting.
A tool that names the pages an engine cited when it left you out can tell you which gap is cheapest to close. Most of those pages are lists and reviews, and many take submissions.
Ask what it tells you to skip.
No engine we track documents llms.txt as a ranking signal, so we do not sell it as a fix. A good list of recommendations says what to skip as clearly as what to do.
Proofsource or Writesonic GEO: what buyers ask
What is the difference between Proofsource and Writesonic GEO?
Writesonic GEO's own site is the current answer on what it does and what it costs. Proofsource asks ChatGPT, Perplexity, Claude and Google AI Overviews the questions your buyers ask, puts a 95% Wilson interval on every number, and names the pages behind each gap with a draft fix held for your approval.
Is there a free trial of Proofsource?
Yes. 200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, no sales call. One free trial per company domain, and the report is about your own domain.
Which AI engines does Proofsource track?
ChatGPT, Perplexity, Claude and Google AI Overviews on the trial; paid plans pick from ChatGPT, Perplexity, Google AI Overview and Claude, each priced per question.
How often does Proofsource re-read the answers?
On the cadence each plan picks: daily or weekly. Answer sets move 9-27% day over day in our own sampling, so daily catches the most. The free trial runs 2 scans a day apart.
Why does the Writesonic GEO column say “Check their site”?
Because we fill a competitor's cell only from facts we have read on its own pages, never from a guess. Writesonic GEO's own pricing and docs are the place to look. If you find a row we got wrong, tell us and we will change it.
Where each claim on this page comes from.
- Wilson score interval. The interval we put on every visibility percentage. Introduced by E. B. Wilson in 1927 and standard for binomial proportions, because it stays honest at small sample sizes and near 0% or 100% where the naive normal approximation breaks.
- Proofsource sampling: day-over-day change in which brands get named, same question one day apart. Perplexity 27%, ChatGPT 18%, Google AI Overviews 12%, Claude 9%. How we measure.
- Writesonic GEO's own site, pricing and docs, for every cell marked “Check their site”. Check a row and find we've got it wrong? Tell us and we'll change it here.
A free trial settles this faster than either of us can write about it.
200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, and the report is about your domain: which buyer questions name you, who is named instead, and the pages each engine cited.
Google AI OverviewsGoogle AI Mode
