Hey, it's Jennie.
Today I'm bringing you two apps that built their brands on TikTok using nothing but "Before/After" videos. Almost zero ad spend.
Usually when people think about app marketing, they think about paying influencers for reviews or running performance ads. But these two apps went the opposite direction. They turned their product's output into the content itself.
No explanation. No copy. Just Before → After. An 8-second video.
But one of them hit 42.9 million views and became #1 on the App Store. The other was built by a 19-year-old and hit #1 in Health & Fitness.
1. Remini (@remini) — One TikTok Video Made It #1 on the App Store
Remini is an AI app that turns blurry photos into ultra-HD. It was originally built by a Chinese startup in 2019, then acquired by Italy's Bending Spoons in 2021. After the acquisition, they rewrote the entire codebase. Every single line.
Before the acquisition, it was just a small photo editing app. Around 10 million downloads.
But then TikTok changed everything.
The Moment It Blew Up: @Gracesplace's 42.9M View Video
In July 2023, a TikToker named @Gracesplace posted a single video:
- Upload a few casual selfies (Before)
- → Run Remini's AI Headshot feature
- → Out comes professional photos in different poses and outfits (After)
That video hit 42.9 million views. 2.9 million likes. In 4 days.
That one video pushed Remini's daily revenue from $90,000 to $567,000. A 5x jump in one week. On July 11th, it became the #1 app on the entire US App Store — beating out Instagram Threads, which had just launched.
40 million downloads poured in over two weeks. All from one video.
The Content Formula
Every Remini TikTok follows the exact same pattern:
- Blurry / old / casual photo (Before)
- → Run it through Remini
- → Sharp HD / professional photo (After)
Before
After
That's it. No narration. The only text is "Before / After." Videos are 8–15 seconds long.
But the key insight is that Remini didn't just go viral once. They kept creating new viral cycles with every new feature.
| When | Feature | Result |
|---|---|---|
| July 2023 | AI Headshots | #1 App Store, 40M downloads in 2 weeks |
| Late 2023 | AI Baby Generator | TikTok baby tags up 500% |
| May 2024 | Clay Filter | #1 on China App Store, beat Douyin |
| 2025 | Birthday Retro Filter | Seasonal viral cycle repeated |
Not a one-hit wonder. Every feature release triggers a new viral cycle.
The Remini Clay Filter went viral across Xiaohongshu, Weibo, and Douyin in China
The Numbers
| Metric | Value |
|---|---|
| Total Downloads | 450 million (as of Aug 2024) |
| Downloads in 2024 alone | 120 million (#2 AI app globally, right after ChatGPT) |
| Monthly Active Users | 90–100 million |
| TikTok #remini Hashtag | 1.4 billion views |
| Cumulative Revenue | $200M+ |
| Peak Daily Revenue | $567,000/day |
| Bending Spoons Valuation | $11 billion (Oct 2025) |
The second most downloaded AI app in the world in 2024. Right behind ChatGPT.
Why It Works
Here's the core insight: using the product IS the content.
A user enhances their grandma's photo with Remini. The result is so impressive they post it on TikTok. Someone else sees it and thinks "I need to try that." They download the app, enhance their own photo, and post it too. Infinite loop.
New user downloads → Enhances their photo → Posts again → Viral (repeat)
Here's the wild part: Remini's official TikTok account (@remini) only has about 160,000 followers. But the #remini hashtag has 1.4 billion views. Over 99% of the content is made by users, not the brand. Every single user is a marketer.
2. Cal AI (@calai.app) — A 19-Year-Old's Calorie App That Hit #1 on TikTok
Cal AI is an app that analyzes calories and nutrients from a photo of your food. Zach Yadegari, who was 19 at the time, built it in 2023. No outside funding. Completely bootstrapped.
But the calorie tracking market already had heavyweights like MyFitnessPal and Lose It!. There was no room for a late entrant to compete head-on.
So Cal AI took a completely different approach.
They Ran Two Types of Content at Once
If you look at Cal AI's TikTok, there are two distinct types of content:
1) AI Avatar Transformation (The Viral Hook)
- Ordinary selfie (Before)
- → AI transforms it into a professional portrait (After)
- Caption: "think i win the AI trend"
No explanation. Just results. When people comment "how do you do this?" — that's the marketing right there.
2) Food Scanning Demo (The Core Product)
- Take a photo of your meal (Before)
- → AI breaks down calories and nutrients (After)
- "What I eat in a day" format
This is also Before/After. The transformation from a food photo into calorie data is inherently satisfying to watch.
Why This Strategy?
What Cal AI did was Attention Arbitrage.
Calorie tracking content barely gets 10,000 views. But AI avatar transformations and food scanning demos pull 10–50 million views with the same effort.
But here's where it gets even smarter: Cal AI ran hundreds of micro-influencers simultaneously. Fitness creators with 10K–500K followers, each posting content that looked like natural UGC, not ads.
On top of that, they used TikTok's Spark Ads — boosting these organic-looking creator videos with paid spend. Organic reach + paid amplification at the same time.
| Stage | Content | Purpose |
|---|---|---|
| Stage 1 | AI avatar + food scan demos | Build viral follower base |
| Stage 2 | Hundreds of micro-influencer UGC | Trust + volume |
| Stage 3 | Spark Ads boost | Paid that looks organic |
The Numbers
| Metric | Value |
|---|---|
| Total Downloads | 5–10 million+ |
| TikTok Followers | 500–800K+ (growing fast) |
| Viral Video Views | 10–50 million+ |
| App Store Ranking | #1 US Health & Fitness (2024) |
| Est. Monthly Revenue | $1–2M+ |
| Founder's Age | 19 years old (at launch) |
A 19-year-old's bootstrapped app hit #1 in US Health & Fitness on the App Store. No investors. No funding.
Two Brands, Two Strategies — Same Format
| Remini | Cal AI | |
|---|---|---|
| Core Product | AI Photo Enhancement | AI Calorie Tracking |
| TikTok Content | Product output (Product = Content) | AI avatars + food scans (Product ≠ Content) |
| Strategy | One feature, pushed hard | Viral content first, then convert |
| Content Creators | Users create it themselves | Hundreds of micro-influencers |
| Ad Spend | Near zero (users do it) | Spark Ads boost |
| Result | 450M downloads, #2 AI app worldwide | #1 App Store, bootstrapped by a 19yo |
The Takeaway
These two cases share one thing in common:
"Don't explain. Just show."
Remini showed blurry photos becoming sharp. Cal AI showed ordinary selfies becoming professional avatars, and food photos becoming calorie data. No narration. No copy. No CTA.
But people organically ask "what app is this?" in the comments. That's the most powerful marketing there is — people seeking you out because they're genuinely curious. Not because of an ad, but because of curiosity.
The fascinating part is the difference in scale. Remini was acquired by a company now valued at $11 billion. Cal AI was bootstrapped by a 19-year-old working solo. But the same format worked for both. Before/After isn't about the size of your budget — it's about the impact of the transformation.
And here's one more thing worth noting from Remini: their official account has 160K followers, but their hashtag has 1.4 billion views. The brand isn't creating the content — the users are. That's the real flywheel.
The Before/After format works on TikTok because the result IS the hook. If someone thinks "whoa, what is that?" within 3 seconds, the video has already won.
But one more thing to keep in mind: both of these apps create visual output. For Before/After to work, the "change" has to be visible. It's hard to pull this off with a coding tool or a project management app. Whether your product can create a visual transformation — that's the first checkpoint.
Jennie
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