Proofsource vs Siftly
Pick Siftly if you want tracking bundled with content production: GEO blog posts with auto-publish, citation outreach campaigns and, higher up, Reddit and social distribution, with a 7-day trial and no card. Pick Proofsource if you want ChatGPT, Perplexity, Claude and Google AI Overviews measured together from the first scan, a 95% interval on every figure, and drafts you approve rather than posts that publish themselves. Siftly's Starter plan tracks 3 engines; Claude arrives on its Scale plan.
Proofsource and Siftly in four facts
Price to start
- Proofsource
- Free trial, then Custom from $64 per brand per month (final price discussed on demo call)
- Siftly
- Free $0; Starter $79/mo; Growth $249/mo; Scale $599/mo; Enterprise custom[1]
Free trial
- Proofsource
- 2 days free, 4 engines, no card
- Siftly
- 7 days on any paid plan, no card[1]
Engines covered
- Proofsource
- 4 on the trial, all 10 on Custom
- Siftly
- 2 engines on Free, 3 on Starter, 5 on Growth, 8 on Scale, from ChatGPT, Google AI Overviews, Perplexity, Gemini, Google AI Mode, Microsoft Copilot, Grok, DeepSeek and Claude[1]
Re-read cadence
- Proofsource
- Daily on Custom, or hourly
- Siftly
- Weekly on Free; daily from Starter[1]
Siftly or Proofsource: which should you pick?
Siftly is a generative engine optimisation platform: AI visibility tracking plus content production, citation outreach and social distribution. Proofsource is an AI intelligence platform that shows which buyer questions name your brand in ChatGPT, Perplexity, Claude and Google AI Overviews, who gets named instead, and exactly what to fix.
Choose Siftly if
- You want content written and auto-published to your CMS as part of the plan.
- You want citation outreach and Reddit engagement handled for you.
- You want a free tier to look around (10 prompts, weekly refresh).
Choose Proofsource if
- You want Claude and Perplexity measured from the start, not from a higher tier.
- You want nothing published in your name without your approval.
- You want an interval on every number before acting on a change.
Proofsource and Siftly on the 9 questions buyers ask
Every Siftly cell was read from Siftly's own pages on 5 Oct 2026 and is footnoted to the page it came from. Prices are theirs, as shown to us; they change, so check the source before you buy.
| Question | Proofsource | Siftly |
|---|---|---|
| Price to start | Free trial; Custom from $64 per brand per month (final price discussed on demo call) | Free $0; Starter $79/mo; Growth $249/mo; Scale $599/mo; Enterprise custom[1] |
| Free trial | 200 answers. 25 Prompts/Question. Top AI engines. 2 days. Free. No card, no sales call | 7 days on any paid plan, no card[1] |
| Questions tracked | 25 buyer questions in the trial; Custom is sized to your questions and brands on a demo call | 10 prompts on Free, 50 on Starter, 100 on Growth, 150 on Scale[1] |
| Engines covered | ChatGPT, Perplexity, Claude and Google AI Overviews on the trial; Custom covers all 10, adding Google AI Mode, Gemini, Microsoft Copilot, Grok, DeepSeek, Meta AI |   Google AI Overviews  Google AI Mode    2 engines on Free, 3 on Starter, 5 on Growth, 8 on Scale, from ChatGPT, Google AI Overviews, Perplexity, Gemini, Google AI Mode, Microsoft Copilot, Grok, DeepSeek and Claude[1] |
| Re-read cadence | Every day on Custom by default, or hourly or as often as you choose, because answer sets move 9-27% day over day in our sampling; the trial runs 2 scans a day apart[3] | Weekly on Free; daily from Starter[1] |
| How you buy | Trial is self-serve with answers the day you sign up; Custom, or Managed where our team does the work, is arranged on a demo call | Self-serve up to Growth; Scale and Enterprise through sales[1] |
| Statistical confidence | 95% Wilson interval on every percentage; alerts wait until a change clears it[2] | Not published on its pricing page[1] |
| Root cause and fix | Each gap names the pages the engines cited instead, with a draft fix held for your approval | GEO blog posts with auto-publish, citation outreach campaigns, Reddit engagement from Growth[1] |
| Getting your data out | Full history as CSV or JSON, any date range; a REST API with API keys; on Custom our team delivers it into Looker Studio or your BI tool | Not published on its pricing page; GA4 and GSC integration from Growth[1] |
What does Siftly cost per month?
Siftly publishes a free tier and three paid tiers by responses tracked, with 20% off annual billing; Scale goes through sales and Enterprise is custom. Every paid plan starts with a 7-day trial and no card. Proofsource starts with a free trial and prices Custom per brand.
Which AI engines does Siftly track on each plan?
Siftly lists 2 engines on Free, 3 on Starter, 5 on Growth and 8 on Scale, drawn from ChatGPT, Google AI Overviews, Perplexity, Gemini, Google AI Mode, Microsoft Copilot, Grok, DeepSeek and Claude. Proofsource asks ChatGPT, Perplexity, Claude and Google AI Overviews on the trial and on every plan.
Siftly or Proofsource: who writes the content?
Siftly writes and auto-publishes it: 8 blog posts a month on Starter, rising to 60 on Scale. Proofsource drafts one fix per gap, built on the pages the engines cited instead, and holds it for your approval, because nothing should publish itself in your name.
Where Proofsource shines: 4 things it is built to do.
Each one is a mechanism: what runs, how often, and what would catch us out if it were not 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.[2]
Four engines from the free trial, all ten on Custom.
ChatGPT, Perplexity, Claude and Google AI Overviews run side by side from the free trial upward, and Custom covers all 10 we track. On Custom the questions are re-asked every day on their own, or hourly if you choose. 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.
Already using Siftly?
You do not have to choose on day one. Here is how teams run Proofsource beside Siftly and decide on their own data.
Keep Siftly running
Nothing about trying Proofsource needs you to stop Siftly. Your history and reports there stay where they are.
Bring your questions across
Export or copy the prompts you track in Siftly and add them as buyer questions in Proofsource, so both tools ask the same things.
Run both side by side
Read the two for the same days on your own domain. Where the numbers differ, Proofsource shows the answers and the pages each engine cited, so you can see why.
Keep what serves your team
Many teams keep one tool for reporting and another for fixes. Pick on your own evidence, not on a comparison page.
Proofsource or Siftly: what buyers ask
Is there a free trial of Siftly?
Yes. Siftly says any paid plan starts free for 7 days with no card, and it also has a free tier with 10 prompts refreshed weekly.
How often does Siftly refresh AI answers?
Weekly on the free tier and daily from Starter, per its pricing page.
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, and all 10 engines on Custom.
How often does Proofsource re-read the answers?
Every day on Custom by default, or hourly if you choose, because answer sets move 9-27% day over day in our own sampling. The free trial runs 2 scans a day apart.
Where do the Siftly facts on this page come from?
From Siftly's own public pages, linked in the Sources list with the date we read them. We have not run Siftly on a domain of our own, so no measured number on this page is theirs. If a row is out of date, tell us and we will change it.
Where each fact on this page comes from.
- Siftly pricing, read 5 Oct 2026. Siftly's own page; no third-party roundup is used as a source.
- 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.
Found a Siftly row that has changed? Tell us and we will correct it here.
More sourced comparisons
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