Shortlist by what you need
Start here if you know why you are leaving Signum.AI.
Want the closest match?
VerciteMost similar to Signum.AI in what it does, its category and its price.
Visit (opens Vercite in a new tab)Need a free plan?
PromptRushHas a free plan, rated 3.9 out of 5.
Visit (opens PromptRush in a new tab)Want to pay less than Signum.AI?
Lucid EngineFrom $29/mo, against from $49/mo for Signum.AI.
Visit (opens Lucid Engine in a new tab)Want the best rated?
Peec AIRated 4.2 out of 5 in our review, against 3.7 for Signum.AI.
Visit (opens Peec AI in a new tab)
At a glance
Green means better than Signum.AI, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 Signum.AIBaseline | 3.7 | $49/mo | Yes | AI-visibility platform that tracks how a brand appears in ChatGPT, Perplexity and Gemini and what drives the citations. | |
| Vercite | 4.0+0.3 | $59/mo$10 more | No | Tracks how ChatGPT, Gemini and Perplexity describe your brand, and what they cite. | vs Signum.AI |
 SEMAI | 3.8+0.1 | Free | Yes | Tracks brand visibility across ChatGPT, Perplexity, Gemini and AI Overviews, then plans the content. | vs Signum.AI |
| PromptRush | 3.9+0.2 | Free | Yes | Visibility scoring across five AI surfaces, including AI Overviews and AI Mode. | vs Signum.AI |
 PromptSignal | 3.6−0.1 | $99/mo$50 more | No | Scores how AI models rank, describe and feel about your brand against competitors. | vs Signum.AI |
 Findable | 3.9+0.2 | Free | Yes | LLM SEO toolkit for tracking and improving brand visibility inside AI answers | vs Signum.AI |
| Lucid Engine | 3.4−0.3 | $29/mo$20 less | Yes | Generative Engine Optimization platform that audits how a brand shows up inside ChatGPT, Perplexity, and Google AI answers. | vs Signum.AI |
| Peec AI | 4.2+0.5 | $90/mo$41 more | No | Tracks not just AI visibility but how AI models frame a brand's reputation | vs Signum.AI |
 HubSpot AEO | 3.9+0.2 | $50/mo$1 more | No | Tracks and improves brand visibility inside AI answer engines like ChatGPT and Gemini. | vs Signum.AI |
The alternatives in detail
In order of how closely each one matches Signum.AI.
Vercite
4.0$59/mo
vs Signum.AI$10 more+0.3
Tracks how ChatGPT, Gemini and Perplexity describe your brand, and what they cite.
- Brand visibility tracking across ChatGPT, Gemini and Perplexity
- Prompt tracking on the exact queries customers use
- Citation discovery showing which sites AI engines quote
Citation discovery gives a short, actionable target list
Prompt quotas bind, since visibility varies by phrasing
SEMAI
3.8Free
vs Signum.AI+0.1
Tracks brand visibility across ChatGPT, Perplexity, Gemini and AI Overviews, then plans the content.
- Visibility tracking across ChatGPT, Perplexity, Gemini and AI Overviews
- Gap analysis against competitors in AI answers
- Content plan generated from identified gaps
Measures a channel most brands have no visibility into
AI-visibility optimisation is young and methods are unproven
PromptRush
3.9Free
vs Signum.AI+0.2
Visibility scoring across five AI surfaces, including AI Overviews and AI Mode.
- Coverage of ChatGPT, Gemini, Perplexity, AI Overviews and AI Mode
- AI Visibility Score dashboard
- Citation intelligence on which sources models quote
Treats Google AI Overviews and AI Mode as distinct surfaces
Paid pricing kept off the landing page
PromptSignal
3.6$99/mo
vs Signum.AI$50 more−0.1
Scores how AI models rank, describe and feel about your brand against competitors.
- Brand visibility tracking across four major models
- Ranking position within AI answers
- Sentiment scoring on how you are described
Sentiment scoring separates good mentions from bad ones
Still onboarding early users, so not fully proven in the field
Findable
3.9Free
vs Signum.AI+0.2
LLM SEO toolkit for tracking and improving brand visibility inside AI answers.
- Brand visibility tracking across ChatGPT, Gemini, Claude and Perplexity
- Analysis of what assistants say about a brand and why
- AI crawler access checks for the site's own content
Covers crawler access, not only mention tracking
No vendor can guarantee placement inside a model's answer
Lucid Engine
3.4$29/mo
vs Signum.AI$20 less−0.3
Generative Engine Optimization platform that audits how a brand shows up inside ChatGPT, Perplexity, and Google AI answers.
- Free baseline visibility check with no signup required
- Truth Layer audit scoring category gaps against named competitors
- Weekly monitoring runs across ChatGPT, Perplexity, and Google AI
Free Checker lets brands see a baseline score before paying anything
Company launched in 2026 with a small following, so its long-term track record is unproven
Peec AI
4.2$90/mo
vs Signum.AI$41 more+0.5
Tracks not just AI visibility but how AI models frame a brand's reputation.
- Sentiment and framing analysis across AI-generated brand mentions
- Source identification tracing AI answers back to G2, LinkedIn, Reddit, and editorial content
- Monitoring across ChatGPT, Perplexity, and Gemini
Sentiment and framing analysis goes beyond simple mention-frequency tracking
Pricing isn't transparently published without a sales conversation
HubSpot AEO
3.9$50/mo
vs Signum.AI$1 more+0.2
Tracks and improves brand visibility inside AI answer engines like ChatGPT and Gemini.
- Citation analysis showing which domains and content types influence AI answers in a category
- Prioritized content recommendations engine for what to create or update next
- Weekly Brand Visibility score tracked over time
Launched by an established marketing platform rather than an unproven point solution
Still in public beta as of its April 2026 launch, so features and pricing may shift
FAQ
Questions people ask
Is Signum.AI free?
Signum.AI has a free plan, and paid plans start from $49/mo.
What is the best free alternative to Signum.AI?
PromptRush is the highest-rated alternative here with a free plan (3.9 out of 5). Other free options: Findable, SEMAI, Lucid Engine.
What is the cheapest alternative to Signum.AI?
Among paid plans, Lucid Engine has the lowest starting price (from $29/mo). If you need it free, start with PromptRush.
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.