Can I contact people who reviewed a competitor's app?

Sluice finds who the reviewers are where it can, and contacts them only through accounts you connect and messages you approve. Many app reviewers use nicknames, so expect a portion to be unidentifiable.

Is this useful for consumer apps or only B2B apps?

It works best for apps that people pay for at work or for a business: scheduling, field service, finance, fitness studios. For pure consumer apps, reviewer lists are better for research than for outreach.

Which reviews are the best leads?

Two and three star reviews that name a specific missing feature or a price change. One star reviews are often about a single bug and go cold quickly.

How much does it cost to try?

Starter is $9 a month with 900 credits. Each run shows its worst-case price before it starts, so you can try one competitor's review page and see the result before spending more.

Finding users and buyers for a mobile app

Start with this question: is your buyer a user or a business?

App teams fall into two camps, and lead generation looks very different for each.

Apps sold to businesses or professionals. A booking app for salons, a job-tracking app for electricians, an expense app for small finance teams. The person who reviews a competitor is often the person who pays. Outreach makes sense.
Consumer apps. A meditation app, a game, a habit tracker. Reviewers are individuals, often anonymous, and one-to-one outreach rarely pays back. Here reviews are research: what people want, in their own words.

The rest of this page leans towards the first camp, with notes for the second.

Why competitor reviews are the place to look

An App Store or Google Play review is a public statement that someone installed a product like yours, used it long enough to have an opinion, and cared enough to write. A two-star review that says "used to be great, now half the features are behind a subscription" is about as clear a buying signal as you will find.

In Sluice you paste a review page and the reviewers become leads, with their stars beside their words. Each is scored 0 to 100 against your profile on three questions: fit, worth approaching or not, and whether what they said suggests they have the problem now. See the App Store and Google Play source pages for how this works on each store.

The other places app buyers talk

TikTok and Instagram. Comments under "app I use to run my cleaning business" style videos are full of people asking what to use.
Reddit. Subreddits for trades, small business and specific professions, where people ask for app recommendations.
YouTube. Comments on competitor tutorials, often from people stuck on a step.
G2, Capterra and Trustpilot, if your app also has a web product reviewed there.

Signal phrases for app teams

Pick phrases that describe the problem or the switch, at least three words each:

"looking for an app"
"switched from [competitor] to"
"app keeps crashing when"
"worth paying for premium"
"alternative to [competitor] app"

Each phrase gets its own record in Sluice: searches opened, people found, how many cleared 70. After two weeks you will know which phrases find buyers and which find teenagers.

A first-month example

This is a worked example on the Starter plan, to show how the credits behave. Starter is $9 a month and includes 900 credits; a credit is one cent.

Step	What you do	Credits
1	Paste the review pages of your two closest competitors on Google Play	Depends on the source; the price is shown before each run. Say you cap it at 400
2	Run two signal phrases on TikTok and Reddit	Say a cap of 300
3	For reviewers who mention their company, use the directory to find a work contact; reveal 20 people scoring 70+ at 5 credits each	100
4	Keep the remainder for a rerun next month	about 100

Starter lookups are billed at supplier cost plus 60%, and only lookups that return something usable are charged. If the first month shows real buyers, Working at $39 adds 5,000 credits in its first month and Autopilot to rerun the review pages on a schedule.

How to write to someone who reviewed a competitor

Do not open with "I saw your review of X". It feels like surveillance. Open with the problem they described, as if you know it is common (it usually is).

Here is a shape that works for professional apps:

Name the problem in their words: "Losing job notes when the app goes offline."
Say in one line how your app handles it.
Offer something concrete: an import from their current app, or a free month.

For consumer apps, use reviews to write better store copy and onboarding instead. If 30 reviewers of a rival complain about a price change, your listing can say "no subscription" in the first line.

Sluice drafts first messages from the person's own words and scores every draft, including your own, before it can be queued. Read competitor reviews as leads for more examples.

What Sluice cannot do for an app team

It cannot identify every reviewer. App store names are often nicknames, and a name with no title, company or location is not billed but is not a lead either.
It does not track installs, attribution or store rankings.
It does not send push notifications or in-app messages. Sending happens only through LinkedIn, Instagram, WhatsApp or email accounts you connect, at $10.80 a month per connection.
Public-post sources depend on platform access, which can change.

Which plan?

A solo developer checking whether competitor reviewers are reachable: Starter at $9. A team that wants new reviews on three competitor pages pulled in every week: Working at $39, with Autopilot under a daily credit ceiling. If your app is sold to developers, the devtools page is closer to your world. Otherwise, start on pricing.