Sunny vs. Viktor: a general AI employee in Slack, or one built for solar deal review
By Mass AI · Reviewed
We read Viktor's public pages on November 4, 2026. Facts about Viktor come only from the sources listed at the end of this page, and anything we could not find there is marked unknown.
Viktor is a general AI employee that lives in Slack and Microsoft Teams, connects to more than 9,800 tools, and works for teams in many industries. Sunny is Mass AI's AI deal review employee built only for residential solar: it reads each sold deal against your requirements, texts the rep for what is missing, and hands ops a clean package. Pick Viktor if you want one AI helper for many kinds of office work, and pick Sunny if you want solar deal review done to your rules without building it yourself.
Side by side
Every Mass AI comparison page uses the same capability names. Where a feature has a different name or does not match one to one, the notes say so.
| Capability | Sunny | Viktor | Notes |
|---|---|---|---|
| Sold deal review | Yes. Reads each sold deal's documents and photos against a minimum intake list plus your own rules, including whether homeowner, property, system and financial details match. | Not a built in job. Whether it can review solar deal files to your rules is unknown. | Viktor is a general AI employee. Its public pages do not mention solar. |
| Rep follow up on missing items | Yes. Looks in your connected systems first, then texts the rep for the one thing it needs and keeps after it until the deal is fixed. | Unknown. | Viktor works in Slack and Teams threads. Texting reps by iMessage or SMS is not described. |
| Ops approval and handoff | Yes. Ops approves the exact package before it goes out, then Sunny sends it and checks that it arrived. | Unknown. | |
| Homeowner messages | Only after the rep approves the exact recipient, message, purpose and project. | Unknown. | |
| Lead response and booking | No. Sunny starts after the deal is sold. | Unknown. | It connects to sales tools such as HubSpot and Salesforce. A lead response product is not described. |
| Design, proposals and contracts | No. Sunny checks the designs, proposals and contracts made in your other tools. | Unknown. | |
| Financing | No. Sunny checks that signed finance documents are in the deal, unless a source confirms a cash deal. | Unknown. | |
| Project tracking after handoff | No. Sunny's job ends when ops approves the handoff and the package arrives. | Unknown. | |
| How reps use it | Reps text Sunny from iMessage or SMS. No login. Ops uses the project view. | People talk to Viktor in Slack or Microsoft Teams. There is also a web app. | Viktor's users are your office team. Sunny's users are your reps, by text, and your ops team. |
| Works in your existing software | Works inside your sales and design software. Each rep has their own computer that Sunny uses the way the rep would. Which tools it connects to is confirmed during setup. | Connects to more than 9,800 tools and has its own cloud computer where it writes and runs code. It says it can run tools that have no API. | Both have their own computer. Viktor has its own cloud computer, and each Viktor user gets an isolated computing space. Sunny has one computer for each rep and uses your software the way that rep would. |
| Memory of how your company works | Yes. Remembers how your company works. The second deal goes faster than the first. | Yes. Keeps workspace context from one task to the next. | |
| Built for residential solar | Yes. Built only for residential solar installers and EPCs. | No. It serves agencies, ecommerce, SaaS, nonprofits, legal and other teams. | |
| Time per deal review | Under 5 minutes per deal. | Unknown. | |
| Pricing | Not published. Pricing for Sunny is negotiated per EPC. | Published. Free to start with up to $100 in credits; Team plan at $100 a month for 40,000 credits, with other credit options from $50 a month; Enterprise is custom. | |
| Setup | Mass AI learns your review rules, connects your tools, and runs Sunny on real deals with your team before anyone relies on it. | Self serve. Sign up free with no credit card and add it to Slack or Teams. |
Where Viktor is stronger
- Handles many kinds of work for many teams: reports, marketing, engineering, operations and finance.
- Connects to more than 9,800 tools, and it says it can run tools that have no API.
- Public pricing and a free start, so you can try it today without a sales call.
- Lives in Slack and Teams, where many office teams already talk.
- Each user gets an isolated computing space, and it publishes security details such as SOC 2 Type 1.
Where Sunny is stronger
- Sunny comes set up for solar deal review: a minimum intake list for residential deals plus your own rules. With a general AI employee, someone on your team has to explain that job.
- Sunny texts reps by iMessage or SMS, where solar reps already are. Viktor works in Slack and Teams.
- Sunny brings ops a finished package, waits for ops to approve it, and checks that it arrived.
- Mass AI learns your review rules and runs Sunny on real deals with your team before anyone relies on it.
Who should pick Viktor
Built for: Teams in many industries, from startups to enterprises, that work in Slack or Microsoft Teams and want an AI employee for reporting, marketing, engineering, operations and finance tasks.
- You want one AI helper for many kinds of office work, not only deal review.
- Your team already works in Slack or Microsoft Teams.
- You want to start today on a free plan with public pricing.
- You have someone who can explain each job to it and check the results.
Who should pick Sunny
Built for: residential solar installers and EPCs whose sold deals stall before install because files are missing things or do not match.
- You are a residential solar installer or EPC and sold deals stall before install.
- Your reps live in their text messages, not in Slack.
- You want deal review set up to your rules and tested on real deals with your team before you rely on it.
- You want ops to approve every package before it moves on.
A solar company could use Viktor for general office work and Sunny for deal review.
Where each option sits
A 2x2 of the options on these pages, placed only where our sources back the place.
- Sunny, under 5 minutes per deal. Reads every document and photo in the sold deal against your rules, texts the rep until it is fixed, and hands ops a package to approve.
- An in-house review team, 3 hours to 4 days per deal by Mass AI's estimate. People read the whole file, chase the rep and own the handoff, at the speed your staffing allows.
- Enerflo. Checks that required items such as a utility bill and signed loan docs are in, shows reps what to fix, sends reminders, and controls when a deal goes to ops. Whether it reads each document to check that details match is unknown, so it sits nearer the middle.
- Wave Sales, not plotted. Its public pages do not describe sold deal review. It answers and books leads.
- Viktor, not plotted. A general AI employee. Its public pages do not describe solar deal review.
- Construct, not plotted. A platform for building your own agents. Its public page does not describe solar deal review.
- Outsourced deal review, not plotted. Where it sits depends on the provider.
Places come from the sourced rows on each comparison page for sold deal review, rep follow up and ops handoff. Checked November 4, 2026.
Questions buyers ask
Could Viktor review my solar deals?
Viktor is a general AI employee and its public pages do not mention solar. You would have to explain your review rules and check its work yourself.
Do both have their own computer?
Yes. Viktor has its own cloud computer and gives each user an isolated computing space, and Sunny has one computer for each rep that it uses the way that rep would.
Where do my people talk to each one?
Viktor lives in Slack and Microsoft Teams. Reps text Sunny from iMessage or SMS and do not log in, and ops uses the project view.
Which one is cheaper to try?
Viktor publishes its prices and has a free plan. Sunny's pricing is negotiated per EPC and starts with setup on your real deals.
Sources and corrections
Last updated: November 4, 2026.
Sources, each read on the date shown: Viktor home page (November 4, 2026); Viktor pricing (November 4, 2026).
Sunny facts come from Mass AI's own product. See Sunny and other comparisons.
Spot something wrong about Viktor? Tell us and we'll fix it.