The Best AI Visibility Tools Under $100 a Month in 2026: What You Actually Get at the Cheapest Tier

Key takeaways: AI visibility tools under $100 in 2026 ## Key takeaways - The cheapest serious entry points are RankScale ($20/mo), Otterly.AI ($29/mo), and Rank Prompt ($39/mo billed annually), but headline prices hide engine add-ons. Otterly's $29 plan only covers four engines; full coverage with Claude, Gemini, and Google AI Mode costs closer to $76/mo. - Engine gating is the biggest hidden cost at the cheap tier. Some tools bundle every engine into the base plan (Rank Prompt, AI Peekaboo, RankScale), while others charge $9 to $165/mo per extra engine. - Refresh frequency quietly drops on cheap plans. AI Peekaboo's $50 tier updates every two days, not daily. Daily tracking only arrives on its $100 plan. - Prompt limits are the real currency. A 15-prompt plan and a 400-prompt plan can be the same product at very different prices, and small prompt sets make your share-of-voice numbers statistically shaky. - For just under $100, Promptwatch's Essential plan ($95/mo) is the strongest option if you want to fix your visibility, not just watch it: 50 prompts, all LLM tracking, MCP and API access included, and automated content workflows most sub-$100 competitors don't offer at all. ## What