# Rachel Sheinbein

> Rachel Sheinbein is a Series A investor at Challenge Day backing Mobile and Health Care. See 18 investments, check sizes, portfolio. Updated Aug 2026.

- Type: Angel Investor
- Fund: [Challenge Day](https://shizune.co/investors/profile/challenge-day)
- Location: San Francisco, United States
- Total investments: 18
- Last investment: Nov 2021
- Lead investor: 17%
- Last updated: Aug 2026
- LinkedIn: http://www.linkedin.com/in/rachelsheinbein/
- X (Twitter): http://twitter.com/RachelSheinbein
- Website: https://x.com/RachelSheinbein

Rachel Sheinbein is a Series A investor at Challenge Day in San Francisco focused on Mobile and Health Care. Rachel Sheinbein is the Angel Invester at The Independent. She attended Massachusetts Institute of Technology.

## Round sizes

| Stage | Round size |
| --- | --- |
| Series A | $2.7M–$15M |
| Series B | $14M–$40M |

## Investment focus

### Industry

| Industry | Investments | Share |
| --- | --- | --- |
| Mobile | 2 | 11% |
| Health Care | 2 | 11% |
| SaaS | 1 | 6% |
| VoIP | 1 | 6% |
| Energy | 1 | 6% |

28 industries tracked in total.

### Stage

| Stage | Investments | Share |
| --- | --- | --- |
| Series A | 4 | 22% |
| Seed | 2 | 11% |
| Series B | 2 | 11% |
| Funding Round | 2 | 11% |
| Pre-Seed | 1 | 6% |

7 stages tracked in total.

## Investments

| Company | Description | Amount | Stage | Date | Website |
| --- | --- | --- | --- | --- | --- |
| Parrable | Parrable is a privacy-friendly identification platform. At the core of its technology is Parrable's proprietary and deterministic identification technology (patents pending) that unifies the user's profile across a given device connecting multiple browsers and apps together without the use of Personally Identifiable Information(PII). Parrable’s identification solution also solves the issue of third-party cookie restrictions in Safari. Given that identity is at the core of what is required for people-based marketing, Parrable provides visibility for marketers into 43% of the U.S. smartphone market that is currently unavailable for them (iOS Safari) where Apple smartphones yield the highest conversion rate. Parrable's Vision Product​ applies Artificial Intelligence to its existing technology using data (e.g. audience, conversion, click, intender data) to weigh buying decisions. This further enables marketers to reach the right user with the right message at the optimal time maximizing ROI. | $8M |  | Nov 06, 2021 |  |
| Parrable | Parrable is a privacy-friendly identification platform. At the core of its technology is Parrable's proprietary and deterministic identification technology (patents pending) that unifies the user's profile across a given device connecting multiple browsers and apps together without the use of Personally Identifiable Information(PII). Parrable’s identification solution also solves the issue of third-party cookie restrictions in Safari. Given that identity is at the core of what is required for people-based marketing, Parrable provides visibility for marketers into 43% of the U.S. smartphone market that is currently unavailable for them (iOS Safari) where Apple smartphones yield the highest conversion rate. Parrable's Vision Product​ applies Artificial Intelligence to its existing technology using data (e.g. audience, conversion, click, intender data) to weigh buying decisions. This further enables marketers to reach the right user with the right message at the optimal time maximizing ROI. | $8M |  | Nov 06, 2021 |  |
| Parrable | Parrable is a privacy-friendly identification platform. At the core of its technology is Parrable's proprietary and deterministic identification technology (patents pending) that unifies the user's profile across a given device connecting multiple browsers and apps together without the use of Personally Identifiable Information(PII). Parrable’s identification solution also solves the issue of third-party cookie restrictions in Safari. Given that identity is at the core of what is required for people-based marketing, Parrable provides visibility for marketers into 43% of the U.S. smartphone market that is currently unavailable for them (iOS Safari) where Apple smartphones yield the highest conversion rate. Parrable's Vision Product​ applies Artificial Intelligence to its existing technology using data (e.g. audience, conversion, click, intender data) to weigh buying decisions. This further enables marketers to reach the right user with the right message at the optimal time maximizing ROI. | $2.7M | Series A | Nov 06, 2021 |  |
| Parrable | Parrable is a privacy-friendly identification platform. At the core of its technology is Parrable's proprietary and deterministic identification technology (patents pending) that unifies the user's profile across a given device connecting multiple browsers and apps together without the use of Personally Identifiable Information(PII). Parrable’s identification solution also solves the issue of third-party cookie restrictions in Safari. Given that identity is at the core of what is required for people-based marketing, Parrable provides visibility for marketers into 43% of the U.S. smartphone market that is currently unavailable for them (iOS Safari) where Apple smartphones yield the highest conversion rate. Parrable's Vision Product​ applies Artificial Intelligence to its existing technology using data (e.g. audience, conversion, click, intender data) to weigh buying decisions. This further enables marketers to reach the right user with the right message at the optimal time maximizing ROI. | $2.7M | Series A | Nov 06, 2021 |  |
| Topknot | Topknot is the online personal development platform for women. With a unique blend of independent exercises and peer group feedback, Topknot supports women on their journey to building the life they want. By teaching skills rooted in coaching and mindfulness, Topknot's intentional interaction model empowers women to address what’s top of mindtoday, while also equipping them for tomorrow’s challenges–providing the space for processing, perspective, and accountability that leads to meaningful change. | $650K | Pre-Seed | Dec 16, 2020 |  |
| Voxeet | Voxeet enables WebRTC with crystal clear 3D surround sound, audio, and video experience and is particularly optimized for a mobile user.Voxeet is now clearly positioned as the leading real-time collaboration platform (cPaaS) that enables WebRTC with the only highly secure, crystal clear 3D surround-sound, audio, and video experience. After beingnamed a Gartner Cool Vendor 2016, we were just recognized as the 2017 "Hot Vendor" in Unified Communications and Collaboration (watch 1 min video) by Aragon Research. Their API library also enables screen sharing, presentation mode, broadcasting, call recording, translation, messaging, scheduling, and more. |  | Convertible Note | Mar 06, 2018 |  |
| Voxeet | Voxeet enables WebRTC with crystal clear 3D surround sound, audio, and video experience and is particularly optimized for a mobile user.Voxeet is now clearly positioned as the leading real-time collaboration platform (cPaaS) that enables WebRTC with the only highly secure, crystal clear 3D surround-sound, audio, and video experience. After beingnamed a Gartner Cool Vendor 2016, we were just recognized as the 2017 "Hot Vendor" in Unified Communications and Collaboration (watch 1 min video) by Aragon Research. Their API library also enables screen sharing, presentation mode, broadcasting, call recording, translation, messaging, scheduling, and more. |  | Seed | Feb 21, 2018 |  |
| Juvo | Juvo was founded with an overarching vision: to establish financial identities for the billions of people worldwide who are creditworthy, yet financially excluded. In partnership with mobile network operators, Juvo’s proprietary Identity Scoring technology uses data science, machine learning and game mechanics to create an identity-basedrelationship with anonymous prepaid users, opening up access to otherwise unattainable mobile financial services. Juvo is a privately held company backed by global business leaders and luminaries in the world of tech, mobile and finance. Its executive team comprises accomplished industry leaders across the data science, consumer internet, financial services and mobile telecom fields. | $40M | Series B | Aug 01, 2017 |  |
| Parrable | Parrable is a privacy-friendly identification platform. At the core of its technology is Parrable's proprietary and deterministic identification technology (patents pending) that unifies the user's profile across a given device connecting multiple browsers and apps together without the use of Personally Identifiable Information(PII). Parrable’s identification solution also solves the issue of third-party cookie restrictions in Safari. Given that identity is at the core of what is required for people-based marketing, Parrable provides visibility for marketers into 43% of the U.S. smartphone market that is currently unavailable for them (iOS Safari) where Apple smartphones yield the highest conversion rate. Parrable's Vision Product​ applies Artificial Intelligence to its existing technology using data (e.g. audience, conversion, click, intender data) to weigh buying decisions. This further enables marketers to reach the right user with the right message at the optimal time maximizing ROI. |  | Series A | Nov 01, 2016 |  |
| Parrable | Parrable is a privacy-friendly identification platform. At the core of its technology is Parrable's proprietary and deterministic identification technology (patents pending) that unifies the user's profile across a given device connecting multiple browsers and apps together without the use of Personally Identifiable Information(PII). Parrable’s identification solution also solves the issue of third-party cookie restrictions in Safari. Given that identity is at the core of what is required for people-based marketing, Parrable provides visibility for marketers into 43% of the U.S. smartphone market that is currently unavailable for them (iOS Safari) where Apple smartphones yield the highest conversion rate. Parrable's Vision Product​ applies Artificial Intelligence to its existing technology using data (e.g. audience, conversion, click, intender data) to weigh buying decisions. This further enables marketers to reach the right user with the right message at the optimal time maximizing ROI. |  | Series A | Nov 01, 2016 |  |

10 of 18 investments shown.

## Co-investors
- [Portfolia](https://shizune.co/investors/profile/portfolia) — VC Fund, 6 deals together
- [Band of Angels](https://shizune.co/investors/profile/band-of-angels) — VC Fund, 4 deals together
- [Angel Ventures](https://shizune.co/investors/profile/angel-ventures-mexico) — VC Fund, 3 deals together
- [AVM](https://shizune.co/investors/profile/avm-2) — VC Fund, 3 deals together
- [Legendary Ventures](https://shizune.co/investors/profile/legendary-ventures) — VC Fund, 3 deals together
- [Momentum Accelerator](https://shizune.co/investors/profile/momentum-accelerator) — VC Fund, 3 deals together

## About Challenge Day

VC Fund

Challenge Day is a nonprofit organization committed to building empathy and compassion in communities.

1 contacts available at Challenge Day.

| Name | Title | Profile |
| --- | --- | --- |
| Rachel Sheinbein | Co-President of the Board | https://shizune.co/investors/profile/rachel-sheinbein |

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## FAQ

### What does Rachel Sheinbein invest in?

Rachel Sheinbein invests primarily in Mobile, Health Care and SaaS startups, most often at Series A and Seed stage. Most of the 18 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.

### What is Rachel Sheinbein's check size?

Rachel Sheinbein typically joins rounds of $2.7M–$15M at Series A and $14M–$40M at Series B. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Rachel Sheinbein participates in.

### When did Rachel Sheinbein last invest?

The most recent investment recorded for Rachel Sheinbein closed in Nov 2021. Shizune tracks 18 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.

### Is Shizune's investor data accurate?

Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.

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