21st Agents SDK

Reez is an AI adult dating and companion app that allows users to match with AI-generated characters, chat with them in real time, and build a connection that remembers previous conversations. The app offers unique AI personas with distinct appearances, backstories, personalities, and communication styles. It is free to start and designed strictly for adults aged 18 or older.

Makiverse is an AI-powered Manga, Comic, and Movie creation platform that helps creators turn ideas into finished artwork, animated content, and full manga chapters. Create images, GIFs, videos, and complete stories with AI-assisted writing, panel generation, dialogue, and editing tools. Build reusable Characters and Props for consistent visuals across scenes, use Tags for faster creation, and refine results with tools like Inpainting, Outpainting, and Upscale.

Seedance 2.5 represents a landmark advancement in AI video generation technology, developed by ByteDance's Volcano Engine as the next-generation production-grade video foundation model. Unveiled in June 2026 and scheduled for full commercial release in early July, this iteration marks a structural leap forward from its predecessor, Seedance 2.0, transcending incremental quality refinements to address the fundamental limitations that have constrained AI video from true commercial viability. Built on an optimized diffusion architecture with industry-leading computational efficiency, Seedance 2.5 transforms AI video from fragmented visual snippets into a complete narrative medium, empowering creators, marketers, studios, and industrial teams to produce polished, consistent, and story-driven video content at unprecedented speed and scale. At the core of Seedance 2.5's breakthrough is its industry-leading 30-second native single-segment generation capability, doubling the 15-second ceiling of the 2.0 version and establishing a new global benchmark for continuous AI video output. Unlike conventional approaches that require stitching multiple short clips together—a workflow plagued by character inconsistency, lighting discontinuities, motion artifacts, and narrative fragmentation—Seedance 2.5 generates full 30-second sequences end-to-end in a single pass. Within this duration, the model maintains remarkable coherence across character appearance, physical motion, lighting atmosphere, and camera logic, enabling complete narrative arcs with proper setup, development, and resolution. This eliminates the labor-intensive post-production stitching process, reduces generation cycles for standard 90-second promotional videos from nine-plus segments to just three or four, and fundamentally elevates AI video from a novelty demonstration tool to a genuine narrative production instrument. The 30-second window comfortably accommodates full product demonstrations, complete short drama scenes, voiceover-accompanied explanatory sequences, and full music video segments, covering the majority of short-form commercial video requirements. Complementing its extended duration is Seedance 2.5's industry-most comprehensive multi-modal reference system, supporting up to 50 reference assets simultaneously including images, video clips, and audio tracks—a nearly fivefold increase over the previous generation's 12-asset limit. This massive expansion delivers unprecedented creative stability and controllability. The model holistically synthesizes stylistic attributes, character likenesses, shot compositions, and tonal qualities from all reference inputs, ensuring consistent visual identity across multiple generations. For brand content production, serialized IP development, and batch video creation, this resolves the longstanding pain point of AI video's inherent randomness—where each generation produces noticeably different results. Marketing teams can lock in brand color palettes, product specifications, and spokesperson appearances across dozens of output variants, while film teams can replicate specific cinematic styles, camera languages, and set aesthetics with remarkable fidelity. The reference system intelligently reconciles multi-source inputs without style conflicts, enabling complex multi-character scenes where every performer maintains consistent facial features, costumes, and proportions throughout the sequence. Seedance 2.5 further elevates creative control through its precision camera manipulation tools and built-in library of 50 professional cinematic shot templates. Creators can directly command camera movements—including push-ins, pull-outs, pans, tilts, and orbital shots—and specify shot scales from extreme close-ups to wide establishing shots. The curated template library organizes proven cinematic compositions by mood, shot type, and pacing, allowing users to achieve professional-grade cinematography without specialized film knowledge. Beyond generation, the model introduces advanced local editing capabilities that enable post-generation modifications such as background replacement, costume changes, and motion adjustments without full re-rendering, transforming the system from a pure content generator into an interactive creative decision-support tool. In terms of visual fidelity, Seedance 2.5 delivers native 4K resolution output at 30 frames per second with 10-bit color depth, eliminating the quality degradation inherent in upscaling lower-resolution sources. Fine details—fabric textures, hair strands, embroidery, and surface materials—remain crisp and defined rather than being smoothed away by super-resolution algorithms. Internal benchmarks demonstrate approximately 15% higher color accuracy than competing models, with particularly improved skin tone rendition and reduced teal-orange color grading bias, making outputs directly usable for professional advertising, corporate video, and broadcast applications. The platform also supports multiple aspect ratios including vertical, square, and widescreen formats for seamless cross-platform distribution across social media, e-commerce, and web channels. Beyond creative industries, Seedance 2.5 is engineered for industrial-grade deployment across manufacturing, retail, education, and advanced technology sectors. Enterprises leverage it to produce localized product documentation, multilingual training materials, and customer support videos at drastically reduced costs. In high-tech applications, it generates synthetic training data for embodied intelligence systems and simulates extreme weather or edge-case driving scenarios for autonomous vehicle development, addressing real-world data scarcity challenges. With API access for workflow automation, batch generation capabilities, and team collaboration features, Seedance 2.5 positions itself not merely as a creative tool but as foundational visual infrastructure for the AI era, bridging the gap between generative technology and real-world productivity.

Lorka AI is an all-in-one AI platform that combines multiple chat models such as GPT, Gemini, and DeepSeek into a single subscription. It offers a fast, flexible, and comprehensive AI toolset designed to enhance productivity and streamline AI usage across various applications.

Sidekick Pro is the ultimate AI executive assistant that answers your calls and texts from its own phone number, triages your Gmail and calendar in real time, joins Zoom and Google Meet meetings to take notes, performs browser tasks for you, and remembers your people, projects, and preferences across web, mobile, and voice. It works 24/7 to help you manage communications and meetings efficiently.

Neolemon is a professional AI cartoon generator that allows users to create consistent AI cartoon characters instantly. Trusted by over 20,000 creators, it is ideal for storytelling, children's books, and various creative projects. The platform requires no design skills and offers an easy start for users.