The problem isn't motivation. It's accountability.
3-min lesson + AI conversation partner every morning
Partner pings at 9pm if you miss your spark
Weekly XP leaderboard with your 5-person squad
62%
DAU/MAU Ratio
vs 21% industry avg
2.4
Avg Daily Sessions
per active user
All cohorts converge >58% at Month 3 | >44% at Month 6
Months 1-3: CAC Recovery
$42
Months 4-12: Core LTV
$89
Month 12+: Extended LTV
$56
187
CAC
$14
LTV:CAC
13.4x
Organic CAC
$6
Word-of-mouth + TikTok UGC driving majority of growth
"I failed three times with Duolingo. With Tandem Sparks I just hit a 90-day streak — and so did my whole squad."
— Gabriela M., Phoenix AZ
4.9
App Store Rating
14,200 reviews
71
Net Promoter Score
World-class retention
Streak celebration videos from authentic users
8.4M impressions/mo
Built-in invite mechanics for 5-person cohorts
K-factor 1.31
4 education creators with proven language audiences
$2.1M reach
Enterprise English product in pilot with 12 companies
$45K avg ACV
| Metric | Tandem Sparks | Duolingo | Babbel | Pimsleur |
|---|---|---|---|---|
| Month-3 Retention | 58% | 23% | 31% | 28% |
| DAU/MAU | 62% | 21% | 18% | 15% |
| NPS | 71 | 42 | 48 | 39 |
| Avg Session (min) | 7.2 | 4.1 | 11.3 | 18.6 |
| LTV | $187 | $68 | $142 | $156 |
Ex-Headspace Product. Grew retention 2x in 14 months.
Ex-Discord Growth Engineering. Built viral loop infra at scale.
Stanford Applied Linguistics PhD. 12 years curriculum design.
Advisor
Luis von Ahn
Duolingo Founder & CEO
Q2 2027
500K Paid Subscribers
Q4 2026
B2B English Product in Beta
Q2 2027
Series B Ready
$60M ARR, 68% gross margin
SERIES A
Pour fuel on a retention engine that's already running.
Lead
Sunrise Consumer Fund
Co-Investor
Talaria Capital
yemi@tandemsparks.com